參數(shù)資料
型號(hào): LMX2487SQX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
中文描述: PLL FREQUENCY SYNTHESIZER, 6000 MHz, PQCC24
封裝: 4 X 4 MM, 0.80 MM HEIGHT, PLASTIC, LLP-24
文件頁數(shù): 24/37頁
文件大?。?/td> 856K
代理商: LMX2487SQX
Programming Description
2.0 GENERAL PROGRAMMING INFORMATION
The 24-bit data registers are loaded through a MICROWIRE Interface. These data registers are used to program the R counter,
the N counter, and the internal mode control latches. The data format of a typical 24-bit data register is shown below. The control
bits CTL [3:0] decode the register address. On the rising edge of LE, data stored in the shift register is loaded into one of the
appropriate latches (selected by address bits). Data is shifted in MSB first. Note that it is best to program the N counter last, since
doing so initializes the digital lock detector and Fastlock circuitry. Note that initialize means it resets the counters, but it does NOT
program values into these registers. The exception is when 22-bit is not being used. In this case, it is not necessary to program
the R7 register.
MSB
LSB
DATA [21:0]
CTL [3:0]
23
4
3
2
1
0
2.0.1 Register Location Truth Table
The control bits CTL [3:0] decode the internal register address. The table below shows how the control bits are mapped to the
target control register.
C3
x
0
0
0
1
1
1
1
C2
x
0
1
1
0
0
1
1
C1
x
1
0
1
0
1
0
1
C0
0
1
1
1
1
1
1
1
DATA Location
R0
R1
R2
R3
R4
R5
R6
R7
2.0.2 Control Register Content Map
Because the LMX2487 registers are complicated, they are organized into two groups, basic and advanced. The first four registers
are basic registers that contain critical information necessary for the PLL to achieve lock. The last 5 registers are for features that
optimize spur, phase noise, and lock time performance. The next page shows these registers.
L
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